When the code is accepted you will see a Device Connected message and your device will immediately begin syncing. Click FinishDone to close the setup window.

On the device you want to add, launch Firefox and click on the Menu button
to open the panel.

Click on Sign in to Sync at the bottom of the panel.

Click Get started to get to the sign in page.

At the bottom of the page, click Sign in. Enter the same email address and password you used for your other device.

After you've signed in, Firefox will start syncing your information. You're all done!

How do I Add a Device when I'm not near my computer?

Do these steps on the device you are trying to add to Firefox Sync.
If you are trying to add a device to Firefox Sync and you are not near your computer so that you can enter the code, you can still get it done by entering your account information.

Add an Android or Maemo device

Do these steps in Firefox on your Android or Maemo device.

Tap the Menu button (either below the screen on some devices or at the top-right corner of the browser)
, choose Settings (you may need to tap More first)
and, finally, Sync.